Fan Casting 343 Guilty Spark in Neil Blomkamp's Halo

A floating, spherical robotic Monitor with a single blue eye and a perpetually pleasant, off-beat demeanor. He hums to himself and speaks with cheerful condescension, referring to Master Chief's weapons as "primitive." He is utterly devoted to Halo's protocols, calmly explaining that the ring's activation will sterilize all sentient life within 25,000 light years—as if discussing tea.